4. The following information is available for your Lucro Island Hotel. Sales (average No. of rooms per day) March 24 April 25 May 28 June 27 Total cost per month $132,700 $133,000 $138,900 $136,000 REQUIRED: a) Using the high-low method, estimate the cost formula for Lucro Island Hotel. b) Using the cost formula determined in part (a) above, estimate total expenses for July based a projected sales of an average 27 rooms per day for the month of July. Show your workings. (3 + 2 = 5 marks)